To determine the number of consonant letters in the English alphabet that appear the same when viewed in a mirror, we first identify the uppercase consonants: B, C, D, F, G, H, J, K, L, M, N, P, Q, R, S, T, V, W, X, Y, Z.
Next, we assess which of these letters are symmetrical about a vertical axis, meaning they look the same in a mirror. These letters are:
Counting these letters, we find:
The number of consonant letters that remain unchanged in a mirror is 11.
Therefore, the correct answer is 11.